Dynamic data of a fixed wpf document

Question

I create FixedDocumentand dynamically add pages.

public partial class Window1 : Window
{
    FixedDocument fd = new FixedDocument();
    TextBlock page1Text = new TextBlock();

    public Window1()
    {
        InitializeComponent();
    }

    private void Print_Click(object sender, RoutedEventArgs e)
    {
        PrintDialog pd = new PrintDialog();


        fd.DocumentPaginator.PageSize = new Size(pd.PrintableAreaWidth, pd.PrintableAreaHeight);

        for (int i = 0; i <= 5; i++)
        {
            FixedPage page1 = new FixedPage();
            page1.Width = fd.DocumentPaginator.PageSize.Width;
            page1.Height = fd.DocumentPaginator.PageSize.Height;

            pages();
            page1.Children.Add(page1Text);
            PageContent page1Content = new PageContent();
            ((IAddChild)page1Content).AddChild(page1);
            fd.Pages.Add(page1Content);
        }

        DocumentViewer dr = new DocumentViewer();
        dr.Height = 700;
        dr.Document =fd;

        stack.Children.Add(dr);


    }

    private void pages()
    {
        page1Text.Text = "This is a test";
        page1Text.FontSize = 40;
        page1Text.Margin = new Thickness(96);

    }

}

The code still gives an error that page1content is a child of another parent.

Answer 1

I have done it. The solution is as follows

private void Print_Click(object sender, RoutedEventArgs e)
    {
        PrintDialog pd = new PrintDialog();


fd.DocumentPaginator.PageSize = new Size(pd.PrintableAreaWidth,fd.PrintableAreaHeight);

        for (int i = 0; i <= 5; i++)
        {
            FixedPage page1 = new FixedPage();
            page1.Width = fd.DocumentPaginator.PageSize.Width;
            page1.Height = fd.DocumentPaginator.PageSize.Height;

            UIElement page1Text = pages();
            page1.Children.Add(page1Text);
            PageContent page1Content = new PageContent();
            ((IAddChild)page1Content).AddChild(page1);
            fd.Pages.Add(page1Content);
        }

        DocumentViewer dr = new DocumentViewer();
        dr.Height = 700;
        dr.Document =fd;

        stack.Children.Add(dr);


    }

    private UIElement pages()
    {
        Canvas pcan = new Canvas();

        TextBlock page1Text = new TextBlock();
        page1Text.Text = "This is a test";
        page1Text.FontSize = 40;
        page1Text.Margin = new Thickness(96);

        pcan.Children.Add(page1Text);


        return pcan;
    }

You can skip the canvas. This is a requirement of my project, so I tried to do it.

Answer 2

This is a simple error for diagnosis; a visual can only ever have one parent, since otherwise you will have a circular dependency in VisualTree. Check your code to see if you use the same visual twice.

, , ; , - , . (canvas.Parent.Remove(canvas)).

, , .

---

vCanvas while(loop). Canvas .

var visual = /* unknown */;
var fd = new FixedDocument();   
while(loop)
{
    var canvas = PageInit();
    var page = new FixedPage();
    page.Width = visual.DocumentPaginator.PageSize.Width;
    page.Height = visual.DocumentPaginator.PageSize.Height;
    page.Children.Add(canvas);

    PageContent pageContent = new PageContent();
    ((IAddChild)pageContent).AddChild(page);
    visual.Pages.Add(pageContent);
}

Canvas PageInit().

private Canvas PageInit()
{
    var tb = new TextBlock();
    tb.Text = "From Data";
    var canvas = new Canvas();
    canvas.Children.Add(tb);

    return canvas;
}